Unwanted SMS

I have been getting specials sms'd to me for the past few months now from Lyndhurst Superspar. I have never been to Lyndhurst Superspar, I live in Cape Town. I've tried calling the Lyndhurst Superspar and they have been totally *********** with this. Nobody is able to direct me to the person who sends out their specials via sms. The supervisors are clueless and I am still waiting for the manager to call me. I have even tried logging a complaint on the Spar website, but no response!!!